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Many young people don't work hard, and regret it later when the opportunity is gone.They only realize it________it is too late.

A．when　B．before

C．in case　D．until

 

A

【解析】考查狀語從句。句意：很多年輕人不努力，當機會失去的時候才后悔。他們認識到這一點的時候已經太遲了。when意為”當……的時候”，根據句意可知，選A。

 

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